Return 404 for non-existing logical key

[kevinemoore]

Description

Pkgselect should not crash and return a proper error response when queried for details of a non-existing logical key.

TODO

• Unit tests
• Automated tests (e.g. Preflight)
• Documentation
  • Python: Run build.py for new docstrings
  • JavaScript: basic explanation and screenshot of new features
• Changelog entry

[akarve]

Looks fine but you need a CHANGELOG entry

[codecov]

Codecov Report

Merging #2307 (8676f5b) into master (fea1f5f) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2307      +/-   ##
==========================================
+ Coverage   44.22%   44.26%   +0.04%     
==========================================
  Files         488      488              
  Lines       23548    23566      +18     
  Branches     3011     3011              
==========================================
+ Hits        10414    10432      +18     
  Misses      12281    12281              
  Partials      853      853              

Flag	Coverage Δ
api-python	89.82% <ø> (ø)
catalog	14.60% <ø> (ø)
lambda	94.00% <100.00%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
lambdas/pkgselect/index.py	91.02% <100.00%> (+0.35%)	⬆️
lambdas/pkgselect/test/test_pkgselect.py	100.00% <100.00%> (ø)

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